//package enumerations;// enumerations/Shapes.java
//// (c)2021 MindView LLC: see Copyright.txt
//// We make no guarantees that this code is fit for any purpose.
//// Visit http://OnJava8.com for more book information.
//// {NewFeature} Preview in JDK 17
//// Compile with javac flags:
////   --enable-preview --source 17
//// Run with java flag: --enable-preview
//import java.util.*;
//
//sealed interface Shape {
//  double area();
//}
//
//record Circle(double radius) implements Shape {
//  @Override public double area() {
//    return Math.PI * radius * radius;
//  }
//}
//
//record Rectangle(double side1, double side2)
//  implements Shape {
//  @Override public double area() {
//    return side1 * side2;
//  }
//}
//
//public class Shapes {
//  static void classify(Shape s) {
//    System.out.println(switch(s) {
//      case Circle c && c.area() < 100.0
//        -> "Small Circle: " + c;
//      case Circle c -> "Large Circle: " + c;
//      case Rectangle r && r.side1() == r.side2()
//        -> "Square: " + r;
//      case Rectangle r -> "Rectangle: " + r;
//    });
//  }
//  public static void main(String[] args) {
//    List.of(
//      new Circle(5.0),
//      new Circle(25.0),
//      new Rectangle(12.0, 12.0),
//      new Rectangle(12.0, 15.0)
//    ).forEach(t -> classify(t));
//  }
//}
///* Output:
//Small Circle: Circle[radius=5.0]
//Large Circle: Circle[radius=25.0]
//Square: Rectangle[side1=12.0, side2=12.0]
//Rectangle: Rectangle[side1=12.0, side2=15.0]
//*/
